Lynch's was still my favorite version of Dune despite flaws.
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I know its nerdy but I absolutely hate when movies of classic books think the story needs to be changed (I'm looking at you, Peter Jackson).
In a vacuum I don't love the changes he made to Part 2 but I can also see how they will make it flow much better into Part 3 than Dune > Dune Messiah ever did (that always felt disjointed to me); as well as make that story more compelling.
Not really. The biggest issue is time. As far as i noticed, one needs 2 hours of movie for 100 pages of a book. Anything below this (fitting 400 pages in 2 hours) is art. That's why Lynch's version is better.